[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/io/dup2.c b/ap/libc/glibc/glibc-2.23/io/dup2.c
new file mode 100644
index 0000000..d16ba54
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/io/dup2.c
@@ -0,0 +1,44 @@
+/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+
+/* Duplicate FD to FD2, closing the old FD2 and making FD2 be
+ open the same file as FD is. Return FD2 or -1. */
+int
+__dup2 (int fd, int fd2)
+{
+ if (fd < 0 || fd2 < 0)
+ {
+ __set_errno (EBADF);
+ return -1;
+ }
+
+ if (fd == fd2)
+ /* No way to check that they are valid. */
+ return fd2;
+
+ __set_errno (ENOSYS);
+ return -1;
+}
+libc_hidden_def (__dup2)
+stub_warning (dup2)
+
+weak_alias (__dup2, dup2)